Recently I had the pleasure of working with my friend Jesse Liberty on a new Pluralsight course focused on helping you get started building Xamarin apps in a test-driven fashion. In under an hour he walks you through building out a real app using tests right from the start, running those tests on both iOS and Android, and also getting into writing UI tests to run locally as well as in Test Cloud.
If you're looking for a good way to see testing in action with mobile development, please check it out!